The human eye has an approximate angular resolution of ϕ = 5.8×10^–4 rad and a typical photo printer prints a minimum of 300 dpi (dots per inch, 1 inch = 2.54 cm). At what minimal distance z should a printed page be held so that one does not see the individual dots.

Question

Philoid · Accepted Answer

Given,

ϕ = 5.8×10^–4 rad, printing rate=300 dpi=300 dots/2.54 cm

Let the distance between two dotes be L

At a distance Z angle subtended will be,

∴ the minimal distance Z should a printed page be held so that one does not see the individual dots is 14.5 cm

The human eye has an approximate angular resolution of ϕ = 5.8×10–4 rad and a typical photo printer prints a minimum of 300 dpi (dots per inch, 1 inch = 2.54 cm). At what minimal distance z should a printed page be held so that one does not see the individual dots.